ESR dating, Ar-Ar dating and its tectonic implications of tectonic activity in adjacent area of Anhui-Zhejiang-Jiangxi
YANG Xinpeng1, LIU Beibei1, CHENG Zhou1, ZHENG Zongping2, DENG Ke3, HOU Dehua1, ZHANG Liguo1
1. Hebei Institute of Regional Geological Survey, Heibei Langfang 065500, China; 2. No.2 Geological Brigade of Hebei Geology and Mineral Exploration Bureau, Hebei Tangshan 063004, China; 3. No.5 Geological Brigade of Tibet Geology and Mineral Exploration Bureau, Qinghai Geermu 816300, China
Abstract：The tectonic position of adjacent areas in Zhejiang-Jiangxi-Anhui is located in the northern margin of the eastern section of Jiangnan orogenic belt, which have experienced multi-period tectonic movements, including Caledonian Period, Indochinese Period and Yanshanian Period. Fault belts with various orientation and different geological ages were formed during the tectonic movements, and the tectonic movement during Yanshanian Period is the most active. Based on the ESR dating, Ar-Ar dating and geological field investigation, the authors focus on the tectonic activity characteristics in the Late Yanshania. The Ar-Ar dating in Dongyuan deposit area is (113.5±1.1) Ma, and ESR dating of quartz veins in the fault is distributed between 120 and 100 Ma, approximately (115±5) Ma. The ESR dating of quartz veins in the fault of Tongcun rock mass and surrounding rock of Shichangwu Formation in Late Ordovician is distributed between 120.2 and 100.4 Ma. Therefore, this research shows that a strong tectothermal event occurred in Late Yanshanian Period (120~100 Ma) and a tectonic reversal from extrusion to stretch occurred in late and middle Early Cretaceous.
杨鑫朋, 刘蓓蓓, 程洲, 郑宗平, 邓科, 侯德华, 张立国. 皖浙赣相邻区构造活动ESR测年、Ar-Ar测年及其构造年代学意义[J]. 中国地质调查, 2022, 9(6): 23-32.
YANG Xinpeng, LIU Beibei, CHENG Zhou, ZHENG Zongping, DENG Ke, HOU Dehua, ZHANG Liguo. ESR dating, Ar-Ar dating and its tectonic implications of tectonic activity in adjacent area of Anhui-Zhejiang-Jiangxi. , 2022, 9(6): 23-32.
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2022, Vol. 9 
